Make pipelineUrl nullable in DastProfileCreate

This field was mistakenly marked as being non-null.

doc/api/graphql/reference/gitlab_schema.graphql

@@ -5737,7 +5737,7 @@ type DastProfileCreatePayload {
   """
   The URL of the pipeline that was created. Requires `runAfterCreate` to be set to `true`.
   """
-  pipelineUrl: String!
+  pipelineUrl: String
 }
 
 """

doc/api/graphql/reference/gitlab_schema.json

@@ -15668,13 +15668,9 @@
 
               ],
               "type": {
-                "kind": "NON_NULL",
-                "name": null,
-                "ofType": {
-                  "kind": "SCALAR",
-                  "name": "String",
-                  "ofType": null
-                }
+                "kind": "SCALAR",
+                "name": "String",
+                "ofType": null
               },
               "isDeprecated": false,
               "deprecationReason": null

doc/api/graphql/reference/index.md

@@ -914,7 +914,7 @@ Autogenerated return type of DastProfileCreate.
 | `clientMutationId` | String | A unique identifier for the client performing the mutation. |
 | `dastProfile` | DastProfile | The created profile. |
 | `errors` | String! => Array | Errors encountered during execution of the mutation. |
-| `pipelineUrl` | String! | The URL of the pipeline that was created. Requires `runAfterCreate` to be set to `true`. |
+| `pipelineUrl` | String | The URL of the pipeline that was created. Requires `runAfterCreate` to be set to `true`. |
 
 ### DastScannerProfile
 

ee/app/graphql/mutations/dast/profiles/create.rb

@@ -13,7 +13,7 @@ module Mutations
               description: 'The created profile.'
 
         field :pipeline_url, GraphQL::STRING_TYPE,
-              null: false,
+              null: true,
               description: 'The URL of the pipeline that was created. Requires `runAfterCreate` to be set to `true`.'
 
         argument :full_path, GraphQL::ID_TYPE,